Pump.



PATENTED APR. 16, 1907.

l G. B. PETSGHB- PUMP.

APPLIOATION FILED APR. 22, 1903. l

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110.850,11-8. 'PATENTED APR.16,'1907.

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Y PUMP. v A'PPLIOATION rILBp APR.22,1903.

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PATENTED APR. 16, 1907.

Nol 850,178.

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PUMP.

PPLIOATION FILED 23.122.1903.

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UNITED STATES PATENT OFFICE.

GUSTAV BERNHARD PETSCI-IE, OF PHILADELPHIA, PENNSYLVANIA, AS- SIGNOR TO SOUTHWARK FOUNDRY & MACHINE COMPANY, OF PHILA- DELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

PUMP.

Specification of Letters Patent.

Patented April 16, 1907.

Application filed April 22, 1903. Serial NoL 153,775.

the admission and delivery valves in pumps,4

particularly those having sliding gridironvalves, and is especially adapted and intended for use in connection with air-pumps, such as are known as compressing or blowing engines, though in many of its features it is also adapted for use in connection' with pumps used for propelling incompressible iiuids.

My invention is also especially adapted and intended for use in connection with pumps actuated by means ofas or similar engines, which have less adapta ility to meet conditions which impose upon the motor Work in excess of that for which it is especially designed and adapted than is the case with steam-engines of the usual construction; and the object which I have especially in view is to so construct the pump having sliding gridiron-valves and its admission-valves so connected with the engine as to move in a fixed relationship with the propelling-piston of the pump that the time of closing of the admission-valve can be retarded at will, so as to lighten the work by imposing upon the propelling-piston the labor of propelling or compressing only a portion of the full charge of the pump-cylinder. i

Other objects which I have in view are to provide an exceedingly simple and eiiicient mechanismfor operating at the same time both the peculiar mechanism of the admission-valve and the certain valve-'operating devices acting upon the delivery-valve. This and other features of my invention will be best understood as described in connection with the drawings, in which they are illustrated, and in which- Figure l is a plan view of a blowing-engine provided with my improvements; Fig. 2, a

side elevation of the engine; Fi 3, an end view, on an enlarged scale, Wit the plate covering an aperture in the receiver removed and the valve-actuating mechanisms shown in section. Fig. 4 is a perspective view showing the mechanism for actuating the admission-valve; FirT 5, an elevation illustrating a modification of the mechanism for actuating the admission-valve; Fig. 6, a diagram or card illustrating the operation of the engine and different adjustments of the admissionvalve. Fig. 7 is a sectional view of the handwheel connection shown in Fig. 3 and used in connection with the mechanism for adjusting the motions of the admission-valve. Fig. 8 is a diagram illustrating the operation of the admission-valve-adjusting mechanism, and Fig. 9 a diagram illustrating the operation of the mechanism for closing the delivery-valve.

A indicates the base or foundation of the engine; B, a gas-engine, which may be of any convenient construction.

C is a connecting-rod coupling the piston (not shown) with crank D on the main shaftE of the engine, F being a fly-wheel secured on said shaft, and G a bevel-gear also secured on said shaft and driving, through a bevel G, the shaft G2, by which motion'is communi.- cated in the design shown both to the valves of the gas-engine and the valves of the blowing-engine proper. As shown, a gear G3 on the shaft G2 drives, through a gear G4, the shaft G5, (best shown in Fig.2,) which shaft has secured to it cams G6 and G7, which actuate the valve system (generally indicated at H) of the gas-engine. The shaft GZ also ac-' tua'tes, through a gear G8, secured to it, and an engaged gear G, the shaft G1, which shaft has secured to it the eccentrics, (indicated at G11 and G12) which eccentrics, as will hereafter be described, actuate the mechanism which gives motion to the admissionvalve in both directions and that which actuates the delivery-valve to close it.

I is a piston-rod directly connecting the piston of the gas-engine with the propellingpiston (not shown) of the pump or compressing-engine, said piston being in the pumpchamber, (indicated at J J J indicating the receiving-chambers at each end of the chamber J, and J2 the connecting chamber or conduit which couples these chambers J together.

The pump-chamber J is provided with admission-ports at both ends, one being indi- IOO cated at 7c in Fig. 3, while the admissionvalve, lying inside of these ports, may be taken as indicated at K in the same figure. The chamber has also delivery-ports at both ends, the port system being indicated at l in Fig. 3 and the delivery-valve, working on the outside of these ports and in the receiver, being indicated at L.

K indicates the valve-rod of the admissionvalve, and L the valve-rod of the deliveryvalve. The .valve-rod K is, as shown, con'- nected with a slide M, suitably guided and supported and supporting a pivot-pin M', by which it is connected through a pivot-link N with a pivot-pin of link O, the lower end of which is coupled with the eccentric G11, so as to have imparted to it a circular motion, while its upper end is connected with a device which will guide it in a reciprocatory path. As shown, the connection is made through a pivot-pin O2 with a link P, pivoted at P on an arm Q, which arm is secured to a rockshaft Q', having also secured to it the adjusting-lever Q2, having the forked ends (indicated at Q3) and which (see Figs. 3 and 7) connect with trunnionextensions S9 S9 of a ring S8, held in a groove S4 of an annular internally-threaded block, (indicated at Si) screwing upon a threaded rod S and having a sleeve extension S2, to the end of which is connected the hand-wheel S5, the sleeve eX- tension being preferably slit longitudinally, as indicated in Fig. 3, and provided with a taper-thread S6, upon which screws a clamping-nut, (indicated at S7.)

Passing now tothe mechanism connected with the delivery-valve, it will be seen (see Fig. 3) that the valve-stem L has secured to its end the piston T, having projecting from its outer face the hollow cylindrical extension T. The piston T moves in a valve-actuating cylinder, (indicated at U,) and which, as shown, has its front or inner end connected through a conduit U5 with the pump-chamber J, a check-chamber (indicated at Us) being situated in the conduit.-

The outer head U of the cylinder is formed with 4a cylindrical extension of smaller diameter than the cylinder U, in 'which iits the hollow cylindrical extension T vof the piston,- and a choke and non-return device Il*1 is provided, connecting with the outer end of the cylinder U. In the hollow cylindrical eXtension T of the piston moves the valve-closing slide, (indicated at U2,) said slide being preferably made hollow, as shown, and carrying a pivot-pin U3, to which is connected one end of the link V4, pivoted at its outer end to an oscillating arm V2, secured on a rock-shaft V, supported on brackets (indicated at V) and extending out from the edges of the cylindrical extension of the head U. The rock-shaft V has also secured to it a leverarm V3, to the end of which is connected the link Z, the other end of which is secured by an eccentric-ring to the eccentric G12. This delivery valve mechanism is shown here simply as a part of the engine illustrated and because in its combination with the admission-valve mechanism it forms a feature of this invention. Separately it forms the subject-matter of my divisional application, iiled May 11, 19041, Serial No. 207,379, and its broader' features constitute the subjectmatter of my Patent No. 784,122, of March 7, 1895.

In Fig. 5 of the drawings I have illustrated a modification in which in place of actuating the adjusting-lever Q2 by the mechanism described in connection with Figs. 3 and 7 I have provided for the automatic operation of this lever and the parts connected therewith, the lower end of the lever being connected through a link W with a piston-rod W, secured to a piston W2, moving in a cylinder W3, and normally thrust forward by the action of the spring VW, a conduit j leading from the front end of the cylinder W3 to the receiver J of the engine or a part in constant communication therewith. A rear extension of therod W has secured to it a piston W5, working in the cylinder W6, the

ends of which are connected by a conduit W7, in which is situated a regulating-cock WS. In this diagrammatically-illustrated modification the spring VV4 is of suicient strength to hold the parts normally and under` ordinary conditions in the position indicated but when the pressure in the receiver rises above normal it will be communicated through the conduit y' to the front end of the cylinder W3 and will move the piston VV2 backward to a degree proportionate to the excess of pressure in the receiver. The cylinder VVi is filled with oil or other iiuid, the ilow of which from one end to the other is regulated by the adjustments of the cock WB, and this device serves simply as a steadying device, preventing unduly rapid vmovements of the piston-rod W.

The operation of the admission-valve-actuating mechanism is indicated in the diagram, Fig. 8, thel lines of which, correspond' to mechanical parts of the apparatus, are similarlyflettered, and it will be seen that in normall adjustments-to wit, that which causes the admission-valve to open and close at the ends of the stroke of the propellingpiston-the pivot-pin Owill at e'ach rotation of the eccentric G11 describe the path indicated at x, the point indicating that on while the point x2 indicates approximately the point at which the valve will begin to open, the valve moving through this lap during the passage of the point O. from to 1:2, over the portion of the curve indicated at rc3, the greater portion of which, it will be observed, is of such form that the valve will practically remain stationary after having loo ,l

'which the valve K has just closedv port 7c,

moved over its lap and before again moving over its lap to open. It will also be observed. that in normal z-rcljustment, as shown in thel diagram, the point of gi'catest eccentricity of the eccentric G lies at the point X when the valve is edge and edge in the act of closing, as shown in the diagram.

Referring now to the adjustment of parts indicated in dotted lines in Fig. 8, it will be seen that by shifting the adjusting-lever Q2 through the arc indicated, and consequently shifting the other parts, as also indicated, the figure y', which will now be described, by the pivot-point O, will be such as to defer the closing action of the valve with reference to the positively-moving parts of the engine, including the propelling-piston, so that the closure will take place at the point indicated at y which corresponds with the location of the point of greatest eccentricity in the eccentric at the point indicated at Y, and it will be understood that in this adjustment the admission-valve will not close until the propelling-piston has moved through a distance in t e pump-chamber corresponding to the arc between the points X and Y in the diagram, the fluid propelled by it while moving this distance escaping freely through the admission-valve and the actual work not beginning until the admission-valve has closed, these conditions being obviously such that the engine will be able to propel or compress the reduced quantity of fluid against a pressure in excess of that for which the engine is normally adjusted and at which it is capable of propelling the entire contents of the pumpchamber. It will also be seen that my valveactuating mechanism is of such a character that the upper ends of the figures a; and y practically coincide with each other, so that the point y2, indicating the point at which the admission-valve will open, practically coincides with the point a02.

In further explanation of the action of the adjustments in the motions of the admissionvalve I would refer to the diagram marked Fig. 6, in which the line 1 2 indicates the total travel of the compressing-piston, the line 1 3 indicates the normal resistance to be overcome, and the figures 1 2 3 4 the'work performed under normal conditions. Obviously, if the working travel of the piston is reduced by the described adjustments of the admission-valve to an extent indicated by the line 2 5, corresponding to an increase in resistance indicated by the line 3 6, then the work performed by the engine under its new adjustment will be indicated by the figure 1 5 6 7 of equal area to the figure 1 2 3 4.

The operation of the delivery-valve mechanism is easily followed on' Figs. 1, 3, and 9. The delivery-valve is closed when the propelling-piston begins its motion toward said valve and is opened by the action of fluid under pressure admitted to the actuatingcylinder U. In the construction illustrated the air in the cylinder J passes through conduit U5 into the valve-actuating cylinder from the beginning of the con'ipressing stroke of the piston, but so long as the deliveryvalve is held to its seat by pressure in the rey ceiver of the engine materially in excess of that in the blowing-cylinder the frictional resistance will prevent the movement of the valve, which, however, moves with great rapidity when the pressure upon its face and back become approximately equal. At the close ofthe compressing stroke of the piston the eccentric G12 and its connections Z, V3, V27 and V 4 act upon the slide UZ, pushing it inward against the piston T and moving the valve to a closed position; The connection of the link V4 and the oscillating movement imparted to the arm V2 are such that in moving from the position indicated in full lines in the diagram, Fig. 9, which is that in which the valve is edge and edge in closing, to the position in which the link V2 is horizontal7 the valve will simply move over its lap. The further downward movement of the arm V2 will in no wise affect the position of the valve, nor is it affected by the upward movement of the arm, which, after passing the horizontal position, retracts the closing-slide and acts simply to shift it out of the way and leave the valve free to move under the influence of its actuating-cylinder, the succeeding downward movement of the oscillating arm acting, as already described, to close the valve.

The choke-conduits (indicated at U4 and a4) are provided for the purpose of cushioning the outward movement of the actuatingpiston, both 'with regard to the rear side of the actuating-cylinder and with regard to the closing-slide, which in a blowing-engine will not always be retracted to its full extent when the valve is opened. In my applicaticn'iiled April 23, 1903, I have described and shown mechanism for closing the deliveryvalve of a generally similar character to that hereinabove described except that the closing-slide is connected by means of a link VI with a slide reciprocating in a straight line.

Having no'w described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a pump having an admission-valve, the device for operating said valve and varying its time of closing, consisting of a link O, means for imparting to one end of said link a constant rotary motion, means for guiding the other end of said link through a reciprocating path, means for shifting said guiding device to vary the motion of the link, and a link N, pivotally connected to an intermediate point on the link O, and to the admission-valve rod.

2. In a pump having an admission-valve, the device for operating said valve and varying its time of closing, consisting of a link 0,

IIO

means for imparting to one end of said link a constant rotary motion, means for guiding the other end of said link through a reciprocating'path, means Jfor shifting said guiding device to vary the motion of the link, a link N, pivotally connected to an intermediate point on the link O, and to the admissionvalve rod, and means actuated by the pressure of the receiver in the pump, for shifting the guiding device aforesaid to vary the closing of the valve. V p

3. In a pump having an admission-valve,

the device Jfor operating said valve and varying its time of closing, consisting of a link O, means for imparting to one end of said link a constant rotary motion, a link P pivoted to the other end of link O, and to a movable pivot P', means for shifting the position of the movable pivot P, to vary the motion of link O, and a link N, pivotally connected to an intermediate point on the link O, and to the admission-valve rod.

4. In a pump having an admission-valve, the device for operating said valve and varying its time of closing, consisting of a link O, means for imparting to one end of said link a constant rotary motion, a rook-shaft Q', an arm Q, secured to said shaft, a link P, piv-l oted to the arm Q, and to the end of link O, means for turning the rock-shaft and thus varying the position of the pivot on arm Q, and a link N, pivotally connected to an intermediate point on the link O, and to the admission-valve rod.

GUSTAV BERNHARD PETSCHE.

Witnesses:

JOSEPH F. ONEILL, D. STEWART. 

